Abstract
AbstractThe crystal structure of Nb6F15 consists of Nb6F12 clusters that are corner‐shared through linear Nb–F–Nb bridges to form two simple cubic lattices, which interpenetrate each other with F···F van der Waals contacts only. With 15 valence electrons in Nb–Nb bonding states each cluster carries one unpaired spin. 19F NMR and EPR spectroscopic measurements suggest antiferromagnetic ordering in Nb6F15 below 6 K. A spin‐dimer analysis based on tight binding calculations shows that the correct magnetic structure of Nb6F15 associated with this ordering should have the spin arrangement in which two interpenetrating ferromagnetic simple cubic lattices are antiferromagnetically coupled.
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